CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income and Comprehensive Income [Abstract]
Net income (loss)	$ 4,597	$ (3,126)
Other comprehensive income:
Retirement benefits adjustment, net of income taxes	11	12
Total comprehensive income (loss)	$ 4,608	$ (3,114)